Air cleaner



Dec, 15, 1942.

H'. G. KAMRATH AIR CLEANER 2 Sheets-Sheet l Filed Aug. 18, 1934 Dec. 1 5, 1942. H, G, .,AMRATH 2,304,829

AIR CLEANER Filed Aug. 1a, 1954 2 sheets-sheet 2 4 79 I i 75 69 \\V\W 70 65 UI 1 @5.

v j I 56 l 7/ l, 7,2 r l PatentedV Dec. 15, 1942 Am CLEANER 4 ller-bert G. Kamrath, Flint, Mich., assignor to General Motors Corporation, Flint, Mich., a cox' poration of Delaware i Appuauon August 1s, 193'4, serial No. 740,420

Renewed February 21, 1940 24 claims.' (ci. 1x3- 15) 'I'his invention relates to apparatus for removy ing foreign matter from gases and particularly to air cleaners for.use in conjunction with the carburetors of internal combustion engines.

The invention resides in an air cleaner which is particularly. adapted for-use in localities in which there is in the air a large amount of foreign matter which must berenioved before thel air is fit for introduction in'to an internal combustion engine.- Such air cleaners must, without offering undue resistanceto the passage of air, be capable of removing large quantities of dust from it over extended periods of time without any attention orfcare. The principal object the outside, both of these last mentioned means being used for connecting the air cleaner to the intake tube of a carburetor.

The bottom o f the casing I is dished upwardly'.

as shown at 1, and in the lower portion of the vertical side is formed an inwardly extendingbead 8. ,This lower portion is filled with oil 9 up to the level of the lower edge of the bead I. l A sleeve III, which lits upon vthe u-pper end of the tube 4 has an indenture II extending around of .this invention is to provide an air cleaner 15 filtering material container I3 which is substanwith the mentioned characteristics and capatially ythe same shape as the outer casing I, but bilities. spaced therefrom at all points,`the upper outer For a better understanding of the nature and rim lHl being supported upon theaim of the casing objects of this invention, reference' is made to tf BelOW the rim 'I4 the Container is Offset lst, the following specineation wherein there are dedownwardly in contact with the inside of the cass`cribed the embodiments of my invention which ing to form `a tight joint, and then inwardly, as are illustrated in theaccompanying drawings. at I5, a substantial distance, then straight dOWn In the accompanying drawings: las at I6 to about the top of the bead 8 and then Figure 1 is 9, view, partly; 'in section and t inwardly and upwardly as at I1 to the sleeve III.

partly in elevation, of an air cleaner in which 'I'he bottom portion I'I of the container has theremy invention is embodied. f in a series of radial openings I8 extending from Figure 2 is a view similar to Figure 1 of anadjacent) the inner edge toward its outer edge other air cleaner in which my inventinn is ern throughout its circumference and also a series of bodied. i o circumferential slots I9 located adjacent its outer Figure 2a is anenlarged fragmentary -view 30 edge. The purpose of these openings Will bemore of a detail of Ithe air cleanerv shown in Figure 2. Clearly Pointed Out at a later POiIltl Figure 3 is fa, fragmentary vertical section Carried by the container is the filtering elethrough a third air-cleaner in which my invenment 20 Which may be COPPeI' mesh Above t211e tion is embodied. copper mesh is a conical plate 2| which has 4a Figure 4 is a side elevation partly in section 35 angeon eechedge, as shown at' 22 and 23- The of` a fourth air cleaner in which my invention flange 22 is secured to the sleeve I0 near the vtol) is embodied. I' and the flange 23 abuts and is secured to the in- Figure 5 is a bottom plan view of the air cleaner side 0f the Container Well Nl. lThe plane of the shown in Figure 4 with a part 0f the bottom plate is substantially parallel to that of the base I1 broken away. of the container. :The plate also has a vseries of Figure 6 is a view partly in elevation4 and radial openings 24 thereinvwhich extend practi-v partlydn section showing how the air cleaners Gally jfIOm One edge t0 the Other- This D18-te shown in ,the preceding figures may be modiiied covers the copper mesh andconipletes the conto adapt them for use in installations where temer assembly therefor. I there is very little head room. 45 Inside of the tube 4 is located an inverted .U-

The air cleaner shown in Figure 1f includes an shaped rod 25 which is secured-'t0 the Wells 0f the outside casing I which is in the form of a large tlbe by' rivets '25, The upper end. of the IJ is cup shaped member open at the top; Just below flattened out as at 21 and a bolt 28 is secured the topglouvre's 2 are provided in the casing.' An thereto. A cover member 29, dished pward from opening 3 is provided in the horizontal 'center 50 thev Outside flange that fol'ms the rim and then of the bottom ofthe casing and through this having e depressed Central portion, fits-Over the opening 'projects ,a tube I secured therein by bolt; 28 and is secured to the casing by a wing nutv spot Welding. The tube 4 is slotted at itslower 30. The flanged edge 32 0I the @Over enteills e' end as shown at 5, and a ring 6 placed around gasket 3| which contacts the rim Il of the containerv I3 and the lipof the flange extends down over both the rim of the container and rthe rim of thel casing. -v

The air cleaner shown in Figure 1 is intended' for use with a down-draft carburetor. .To install it on such a carburetor, the lower end of the tube 4 is fitted around the carburetor air intake tube. As shown by the solid arrows, air enters the cleaner through the louvers 2, passes down-l wardly between the outer casing-and the con' tainer wall and then through the restriction between the bead 8 and the outside corner of the container I3. The restriction increases the velocity of the air and since it is traveling downwardly, it impinges upon theoil with sulncient velocity to dash the heavier dust particles into the oil and also to pick up a certain amount of oil. This mixture of oil and air is carried up through the radial openings I8. .The cross sectional area of the filter is. of course, larger than that of the openings in the base of the container so the air from sliding too far-within the tube ,33. Secured to the outside of. the larger portion of the tube 4 is a cup-shaped oil sump'36 which has an oil level indicating .bead 31 in its side. The top rim of this cup-shaped member is flanged, as at 38, and extends only up to about one-half the height lof the tube 33. Resting upon the flange 38 is an inverted frusto-conical member v3!! which has made integral therewith a cylindrical base 40. The lower edge of the inverted fiusto-cone reaches almost to the surface of the oil 4I in the sump. The upper edge of the cone is slightly offset, as at 42, to give a seating portion therefor on the flange 38. The cylindrical portion has a series of rectangular openings 43 throughout its circumference which are used as means for taking in air. The upper extremity of the v,cylin drical portion 40 is flanged outwardly as at44.

will expand as it moves upwardly in the filter and its velocity will decrease. This allows the oil to separate 'from the air and flow down the conical filter base toward the oil discharge. slots I9 which are located adjacent the vrestricted air entrance,

above mentioned, the path of the oil being shown by the dotted arrows. i The oil carried up into the filter member will thus keep the lter material coated with oil and the dust in the air that is progressing through the lter will adhere to the oil coated surfaces. This dirt collected in-the'iilter material is picked up by the excess oilA and returns to the oil sump with it.

`The Venturi effect at the restricted portion assists in drawing the dirty oil out of the filter element through circumferential'openings I9. 'Ihe oil being discharged at this point also creates a curtain of oil through which the incoming air must pass which increases the efficiency of the cleaner. y 1

After beingfreed of oil and dirt inthe filter element the cleaned air then passes upwardly through the radial openings 24 in the top conical plate 2I and up to the space just below the cover.V

There it again reverses and goes down through the central tube 4 to the carburetor. The flared uppersend I2 of the center tube of the lter member tends to effect spreading out of the current of air flowing through the lter member 4and thus to eliminate localized high velocity zones in it and to prevent. the current of air carrying over into the center tube 4 oil picked up by it from the .supply in the bottom of the air cleaner. The dust collected by the oil settles in the oil base when the motor is idle and does Anot recirculate thereafter.

The disassembly of the device is very simple and is accomplished by first removing the wing nut and taking oif the cover 29. Then the lter assembly may be removed bodilyby pulling the sleeve I0 from the tube 4. Last, the outside casing may be disengaged ,from the carburetor. The' filter material and casing may then be cleaned. It is, of course, understood thatv in initial installation the filter material is saturated with clean oil so that its surfaces are coated before .the filter is assembled and so after the filter element has been cleaned lit should be again dipped or saturated with clean oil before reassembly. The parts may then be reassembled.

A second inverted frsto-conicalmember is secured to the top flange .44 ofthev member 39 by having its rim portion doubled around the flange, as at 46 best shown in Fig. 2a. The lowerl edge of the inverted frusto-cone=45, is bent upwardly to form an vupright generally frustoconical section 41 with an inwardly directed step in it. The upper edge of this last mentioned section makes frictional contact with the tube 33. ,Circumferentially spaced about the `base of this last mentioned -conical section are,v rectangular openings 48 for the passage of air.

Above this V-shaped section is` mountedan annular lter assembly 49. The casing is formed of a single sheet of metal which is bent to form a hollow annular enclosure 50 for the lter mav terial 5I. At the lower outer edge the sheet is bent outwardly from the general contour ofthe cylindrical side and then back upon itself to v form a lip portion 52 which rests upon the flange 44 through the intermediary'of the rim 46 ofthe member 45. In the lower and upper surfaces of the annular member are formed radial openings 53- and 54. This annular member is supported at the inside periphery by the tube I33 and at the outside periphery by the lip 52 which rests on the flangev 44 throughvthe intermediary of the rim 46 of the member 45 and is held in place by an offset portion of the cover as will be more clearly set forth. y

Inside the tube 33, as in the cleaner shown in Figure l, is supported an inverted U-shaped rod 55 which is secured to the cylinder by rivetsand which supports at its upper flattened end a bolt 56 to which the cover member is secured by wing nut 51. The cover 58 is a large bell-shaped member which comes down over and covers a large part of the whole cleaner. The top portion is domed and is slightly larger than the annular filter assembly, andthe cover then extends downwardly to the lip 52, which is supported on flange 44 through the intermediary of the rim 46 of the member 45. A horizontal portion 59 which rests upon the lip 52 is then formed on the cover and to this horizontal portion is added a vertical portion which skirts the end of the lip and encloses the same.' Below this is a further small offset and then the cover extends down, as at 60, until y it covers the openings 43. The end of the cover is rolled, as at 6I, to form a reinforcing bead.

The air'cleaner shown inv Figure 2 designedI to be installed on a carburetor in the same manner as that shown in Figure 1 and its operation may be described as follows: yAir enters under the lower part of the bell-shaped cover, then flows through holes 43 into' the channelformed between the two downwardly directed surfaces 45 velocity at which it strikes the surface of the oil in thesump. The air is thendetlected upwardly by the oil surface, leaving in the oil the heavier dirt particles and picking. up drops of oil,

then passes through the openings 48 and then of the frusto-conical member 45 to the bottom of the V and then running out of the openings The section 41 of the member. 39 serves to limit the amount of oil carried bythe air into the filter assembly 49 and thus to obviate pull-over of oil-from the air cleaner into the carburetor and engine.

The disassembly of this form is very similar to 2,304,829 yand 39 which directit toward and increase the supports a bplt 13 to which the wing nut 14 is threaded to secure in place over the device the cover 15 whose outer edge is seated on the lip 10 of the lter element. t

- Rigidly secured to the ilange on the lower wall of the annular lter member which is in vturn secured to the sleeve 1I is a conical plate 16, the rim of which is flattened out, as at 11, to be parallel to the lower surface of the annular member. This member acts las a baille ,to the air stream, and prevents too much oil beinghcarried by the air to the filter from the sump. In the upper and lower surfaces of the annular filter member are a series of openings. and 19, which are of varying 1engms, as better shown in the detail in Figure 5. Asshown, there are two short openings-80, then one long opening 8|. The long slots 8l are extended nearly to the outer edge toprovide a return passage'Nior the excess oil carried into the lter means bin-.the air stream.

The air and oil enter the ltering ymeans through the one previously described. The Wing nut 51 is first removed which allows the cover58 to be removed. The lter means may then be lifted from the end of the tube 33 and cleaned. If it is desired to clean the sump also the assembly 39-40-45-41 may be removed from the body 33-36 of the cleaner and the latter disengaged from the carburetor intake and cleaned.

The modication shown in Figure 3 is similar to that shown in Figure 2 but diiers from it in several respects. First'the inverted frusta-conical member 39 of Figure 2 has been eliminated and the shell of the oil container or sump modified to provide a cylindrical section in which the air intake openings 43 are formed and a frustoconical section 62 which has approximately the same relation to the member 35 as the member the short openings 8D and the inner ends of the openings; 8l. Then -the oil ows to the outer periphery and may then return through the smaller outer ends of the slots 8l. order, however,'may be used. Short circumferential slots may be connected to the ends of the longer slots 8l to give a series of annularslots at the edge vto assist in giving sufficient openings 39.v Second, the bottom panel of the annularfilter assembly has been removed and a wire mesh 63 inserted in its place. assembly and the member have been permanently secured together at their outer edges Third. the filter and the member 45 modified at its inner edge to provide a seat for the filter assembly. This gives a construction which is simpler and embodies less parts. The operation is substantially the same as and the mode of disassemblyis similar to that of the air cleaner shown in Figure 2 exn cept inthat the member 45 does not have to be removed from the body separately from the iilter assembly and there are, consequently, less parts `to be handled.

In the modication shown in Figure 4, a baillefor the draining of the excess oil. 'Ihe path of the air through this modication is also shown by arrows. As stated above, the purpose of the bame is to prevent too much oil from being carlied from the sump into the lter material. This is, however, only necessary in installation where the air ilow is high'and if the cleaner is to, be used only on moderate or light air now installa.- tions the baiiie may be dispensed with. The mode oi disassembly of the air cleanershown in Figures 4 and 5 is similar to that of the air cleaner shown in Figure l.

l'n some installations, there is insumcint head room above the carburetor in which to piace an air cleaner, therefore it is desirable to place it to one side of the carburetor. be used in such an. installation, any of the cleaners illustrated in Figures 1 to 5 may be modified as suggested in Figure 6, i. e., by (a) eliminating its stirrups 25, 55 or 12 and the projecting lower end of its central tube; (b) providing a central opening in its cover 29,l 58 or 15; and (c) applying a closure 86 to the lower end of its central tube, applying one end of a U-shaped iitting 88 (whose opposite end is adapted to be connected 5to the air vintake tube of a carburetor) to the opening in/ the cover and connecting the closure and the fitting to the bodyof the cleaner by a stud 82 and a wing nut 81". The lower closure member 86 is secured to the stud 82 by a. thread-v the opposite end of the sleeve which latter acl tion 10 secured near the top of the outsidesurface which engages the rim of the casing and 'is supported thereby. The inner edges of the upper and lower walls of the annularmember are secured to the sleeve 1I which slides down upon and is supported by the central .tube through the L an en'icient, economical device which may easily be disassembled and cleaned for cleaning air used in internal combustion engines.

I claimt 1. An air, cleaner comprising a drum shaped casing having a coveriltting over the 'top portion,

Any other So that it mayair louvres in the side wall and a pool of oil in the base, a cylindrical tube extending up through the base and attached thereto, an annular filter element supported by the central tube and the casing, radial openings of 'different sizes in the i.top and bottom surfaces of the annular member,

and filtering means within the annular member, the casing and the filter, element constituting means for directing the air downwardly to a space below the filter element upon entry whereby it contacts the oil and carries particles thereof up into the filter element to cleanse the air.

2. An air cleaner comprising a drum shaped casing having` a cover fitting over the top portion thereof, a cylindrical tube supported in the center of the casing and projecting through the bottom face'thereof, an annular filter element supported on the central cylinder andthe casing, radial openings of various sizes in the top and bottom surfaces of the annular element, filtering means within the iilter element, and openings in the outer surface of the casing, the casing and the filter element constituting means forA directing the air down below the filter element whereby air taken in through the openings will go below the element, then up through the filtering means and then down through the central tube and out.

3. An air cleaner comprising a casing in the shape of a short cylinder having openings in the rface and an oil bath in the base, a smaller cylinder fitting inside the casing and projecting through the base section of the casing, filtering means supported between the casing and the cylinder by a rigid hollow annular member which is supported at its inner edge by the'cylinder and at its outer edge by the casing, an air passage bead on the casing projecting inwardly tolocate between the outside of the annular member and the casing through which the incoming air travels downwardly toward the oil bath, the lower and upper surfaces of the annular member being' formed of spaced plates with a plurality of radial openings therein, acover secured over the top of the whole, but having 'a space between the vof different sizes in the top and bottom surfaces of the annular element, and aibaiile plate extending over the oil below the annular element,

the casing, and the filter element constituting means for directing the air downwardly to the oil pool upon entry whereby it cont'acts the oil and then changes its direction to ow around the Vend of the baflie to. get vto the filter element.

5. An air cleaner assembly comprisingr a drumshaped-casing having a cylindrical tube projecting through the base and supported within it,

a coverfor the casing, a central hole in the cover, a U-shaped connecting'conduit fitting the hole inl and-mounted on the top of the cover, a plate closing the opening in the bottom of the central tuba-and `a wing nut and a -rod extending through'the central tube, the platey and the conduit to secure the assembly together.

6. In an air cleaner, a drum-shaped casing having an oil bathin the base, .a circumferential the oil level, air louvers in the outer vertical face of the casing, an annular filter element supported within the casing, its outer periphery spaced from the casing to provide an air passage from thelouvers, saidperiphery approaching the bead to provide a restricted, area to increase the air velocity therethrough as it impinges on the oil bath. f

7. `In an air cleaner, two telescoplng members f vspaced apart to provide an annular air passage, an inwardly projecting bead in the outer member which approaches the periphery of the inner member to cause a'restriction in the air passage, said outer member having an oil pool in the base,

iilter material carried by the inner member to remove the dirt and oil from the incoming air, said inner member having a plurality of openings adjacent the-restricted air area whereby the Venturi eiect of the air iiow sucks excess oil fromy the filter. f

8. In an air cleaner, a casing having an oil bath in the base, annular filter means supported within the casing with its periphery spaced from the casing to provide an air passage,-means in the casing admitting air to said passage, and an annular bead in the casing projecting inward toward the filter periphery to'cause a Venturi action and increase air velocity, said filter means having a plurality of openings therein adjacent the restricted area for discharge of excess oil in the fllter whereby the Venturi action appliesv suction to withdraw theoil from the filter.

9. In an air cleaner, a casing having an oil bath in the base,'means admitting `air thereto,

filtering material therein, means for supporting the filtering material including two spaced concavo-convex annular plates, the lower plate having a plurality of arcuate slots near its periphery, means secured to and/k extending between the two plate peripheries and spaced from the casingto provide an air passage, and an inwardly projecting bead in the casing adjacent the lower edge of the filter supporting means to cause a restriction to increase the air flow and cause a y suction from the arcuateopenings in the lower plate.

10. In an air cleaner, an annular receptacular element having an oil bath in the base andA openings in the side walls, an annular filter element supported within the first named element with its outer periphery spaced from the outer wall of the receptacular element to provide an air inlet, and an inwardly projecting bead in the receptacular element to cause a restricted area to increase air Velocity, the filter element including an annular lower plate adjacent the bead having therein av series of radial openings and a seriesof arcuate openingsnear the edge, the first named openings t'o allow the air and oil to pass upwardly into the mter and the second named openings to allow the excess oil to drain at the outer edge into the high velocity air stream. n

11. In an air cleaner, an annular receptacular element, an annular lter element within the first named e1ement,-the inner port-ion of the? filter element comprising a tubular member ared outwardly at the top, an inner tubular member on the receptacular element adapted for telescopic relation with the inner tube ofthe filter `element and Vfrom which the filter element is supported within the receptacular element, a fianged edge on the filter element 'supported upon the outer wall of the receptacular element, and a.

cover supported on top of the filterelement.

`the low pressure zone in the passage through which vliquid may be drawn from the filter element into the low pressure zone.

13. In an air cleaner, a -receptacular body which constitutes a liquid reservoir, air inlet and outlet orificesin the body, a filter element which is disposed within the body between the surface outer edge of the filter element `to define a high velocity, low pressure zone through which air may be conducted toward and over the surface of the liquid in the reservoir, an air outlet orifice in the filter element' which communicates with the air outlet orifice in the body, a liquid discharge orifice in the filter element near its lower of the liquid and the air outlet orifice in the Abody lwith its side wall spaced from the side wall of the body so that it defines a passage constricted at one point to dene a lowy pressure, high velocity zone through which air is conducted from' the air inlet orifice in the body overthe surface of the liquid in the reservoir into the filter element so that it carries liquid from the reservoir into the filter element, and an orifice which comhigh velocity zone and through which liquid may be drawn from the former into the latter.'

14. In an air cleaner, a receptacular body which constitutes a liquid reservoir, air inlet and outlet orifices in the body, a filter element in which there are provided air inlet and outlet ori-` fices disposed between the surface of the liquid and the air outlet orifice in the body with its air outlet orificev in communication with the air outletorifice in the body, a passage constricted at one point to define a low pressure, high ve. locity zone through which air is conducted from the air inlet orifice in the body over the surface of the liquid in the reservoir into the air inlet orifice in the filter element so that it carries liquid from the reservoir into the filter element, and an isolated orifice in the filter element at a lower level than the inlet orifice in it which communicates directly with the low pressure,

outer 'edge which communicates directly with the low pressure, high velocity zone so that liquid supplied to the filter element' from the reservoir will g'ravitate and be drawn through it out of the filter element into the low pressure high velocity zone, and an air inlet orifice which communicates with the mentioned passage lin the bottom of the filter element between its inner edge and the liquid discharge orifice.

17. In an air cleaner, an annular 'receptacula body which constitutes' a liquid reservoir, air in-` let and outlet orices, in thebody, an annular filter element disposed between the inner and outer walls of the body and the air inlet'and out let orifices and spaced from the bottom `of thev municates directly with the filter element and .the mentioned passage near the low pressure,

body to define a passage which communicates withthe air inlet orifice, an air outlet orifice in the filter element which communicates with the air outlet orifice in .the body, an annular air in- 'let orifice in the lowerwallof the lter element,

18. In an air cleaner, an annular receptacular body which constit tes a liquid reservoir,.air inllet and outlet o ces in the body, -an annular filter element disposed between the inner and outer walls of the body and the air inlet and outlet orifices and spaced from the bottom of the body to define a passage which communicates high velocity zonein the mentioned passage andr body to define a passage which communicates with the air inlet orifice, an air outlet orifice in the filter element which communicates with the air outlet orifice in the body, an annular liquid discharge orifice in the bottom o'f the -iilter element near its outer edge, and an annular air inlet orifice in the bottom of. the filter element between its inner edge and the liquid discharge orifice which communicates with the mentionedpassage.

16. In an air cleaner, an annular receptacular body which constitutes a iiquid'res'ervoir, air inlet and outlet orifices inthe body.' an annular filter element with a concave lower Walle-to which liquid is supplied from the reservoirdisposed be-y tween the inner and outer walls of the body and spaced from the latter and the bottom of the body to define a passage constricted at the lower with the air inlet orifice, and an annular baiiie which extends from the inner toward the outer wall of the body but terminates sufiiciently'short 4of. the latter and above the surface of the liquid in the reservoir as to define with the surface of the liquid a pocket through which air passes before it enters the filter element from the air inlet orifice.

19. In an air cleaner, anannular receptacular body which constitutes a liquid reservoir, an annular filter element, with air inlet `and outlet orifices in it, which is separable' from the body and disposed between its inner and outer walls and -rests on the upper end of the former and is spaced from the latter and the bottom of the body to define a passage through which air may `traveltoward the air inlet orifice in the filter elefices in it which is separable from the body and disposed between and rests on-its inner and outer side walls with its outer side wall spaced from thev outer side wall andthe bottom .of the body todene a passage ,through which air may travelltoward the air inlet orifice in-the filter element, an orifice in the outer side wall' of the' body through which `air may be admitted into the passage between the filter element and the outer side wall of the body, a cover for the upper end of the lter element which is separable from the body and the filter element and between which and the body the filter element is clamped,`

' and an air discharge j orifice for the air 'cleaner which communicates with the air outlet orifice in is conducted from the air intake orifice downwardly toward the surface of the liquid and a passage through which air is conducted upwardly from the surface of the liquid toward /the air discharge orifice, and filtering material within the last mentioned passage above the surface of the liquid, an oric through which air enters they last mentioned passage, the specified member having in it above the surface of the liquid near the junctionof the. mentioned passages an opening `through which liquid carried into' the ltering material by the upwardly traveling current of air maybe discharged into the downwardly traveling current of air.

22. In an air cleaner, a bowl-like member, a tube-like member which is secured in an orifice 23. In an air cleaner, a bowl-like member, a tube-like member ,which is secured in an orifice in the, bottom of the bowl-like member and with vit defines a liquid reservoir, an annular filter member with an air inlet orifice in its lower wall and an air outlet orifice in its upper wall disi posed'within the bowl-like member and spaced from its side wall and bottom to define a passage through which air may travel from the atmosphere to the air inlet orifice in the lower wall of the iter member, a cover into which the air outlet orifice in the upper wall of the lter l member opens, a. tube-like member through it defines a liquid reservoir, am annular filter member with an air inlet orifice in its lower wall and an air outlet orifice in its upper wall disposed within the bowl-like member and spaced from its side wall and bottom to define a passage through which air may travel from the atmosphere to the air inlet orifice in Athe lower wall `which air is withdrawn from the air cleaner openingvinto it throughv vthe cover, means for preventing entrance of air into the air cleaner through the first specied tube-like member, and

specified means. v

24. In an air cleaner, a bowl-like member, a

tube-like member which is secured in an orifice l in the bottom of the bowl-like member and with it deiines a, liquid reservoir, an annular filter" member with an air inlet orice in its lower wall andan air outlet orifice in its upperwall disposed within the bowl-like member and spaced from its side wall and bottom to define a passage through of the lter memberya cover into which the air outlet orifice intheA upper Wall ofthe filter member opens, an orifice in the cover, an air outlet tting into which the orifice in the cover opens, a. closure for the lower end of the tube-like member, and means for securing the outlet tting and the closure over the orice in the cover and the lower end of the tube-like member including a member lwhich extends through the orifice in th'e cover and the tube-like member and is connected to which air may travel from the atmosphere to the air inlet orifice in the lower wall of the filter 'member, a cover into which the air outlet orice through the cover, means for preventing entrance of air into the air Vcleaner through the .first specified tube-like member, and means for securingthe cover in place including a member Ywhich extends into the first specified tube-like member and is lconnected to it and the cover.

HERBERT G. KAMRATH. 

